Reamer



' FRANK r. mLLEr., or'xEADvI'LLE', 1 En1asin'.v\a1ua` am n' riflntl No. 1,475,311,

To all whom. 'it 'may concern.'

Be it known that l. 'FRANK I. MILLER,

a citizen of the United States, and a.. resident of Meadville, in the county of Craw- I ford and State of Pennsylvania, have invented certain new and useful Improvements in Reamers, of which the following is a slpecification.

f his invention' relates to reamers and N more particularly to the blades thereof.

In reamers now in luse the blades are formed with a land or guide portion, the edges of which are parallel and the forward end ofthe land abruptly terminates at the ll flat inclined lead or cutting portion of the reamer. It has been found as the result of extensive use that such a. blade dulls quickl'y and does not provide a. smooth hole.

Therefore, an important object of this in- U vention isA to provil a reamer blade in which thelead is rounded and into which the lead merges whereby the cutting edge is maintained for a long riod and whe-reby a smooth hole is provi ed.

Further, the improved reamer blade is formed with a land which adually tars toward its forward enfr and merges into the lead approximately where the radius of the same beginsT thereby providing an additional cutting edge.

A further object is to provide a reamer having blades of the character specified which ma be' economically manufactured or groun and which may be employed without radically departing from established shop practice. '1

Other dbects and advantages of the invention wil be apparent of the following description.

a part of this specification and in'which like numerals designate like parts throughoutl the same, 'l f Figure 1 is a side elevation of one form of reamer equipped with the improved blades,

Figure 2 is an cud elevation of the reamer illustrated in Figure 1,

Figure 3 is-al side elevation of a reamer having integral blades constructed in accordance with this invention, 4

Figure 4 is a perspective. of one of the blades detached,

.ually tapered to a point the cuttingedge 13 approximately where during the course In the accompanying drawing` forming dated November 27, 1923, Serial No. 806,888, tiled December 14, 19122,y Application vfwruaae and February 5, 1924. serial No. 690,886.

Figure 5 is a\detail transverse sectional view taken on line 5 5 of Figure 4,

Figure 6 is a. detail transverse sectional view taken on line 6 6 of Figure 4.

`lfATEN'l" orales. 'i

In the drawing wherein for the purpose of illustration is shown a preferred embodiment of the inventionthe numeraly 10 designates a reamer. equipped with a plurality of blades 1l which may be held in position by thc means illustrated lin Figures l and 2. or by any other means Specifically each blade is formed with a Irounded lead 12 inclined transversely to .produce a cutting edge 13, and it will be seen that the outer edge ofthe blade is' ground to produce a clearance 14.

In carrying out the invention the grinding of the blade to produce the clearance lelgproduccs what is known in the art as the land the edges of which are ordinarily parallel. However, Figures 4, 5, and 6 illustrate that the land is, in thiscase, gradland merges into the radius of` the rounded lead begins whereby to produce an additional cutting edge 16 which co-operates with the cutting edge 13 of the roundedv lead to provide a,

perfectly smooth hole. l A

In summarizing it might beI stated that this invention consists particularly in producing the rounded lead in combination' with the tapered land so as'to` provide the additional cutting edge 16' and to provide a. reamer blade which maintains its cutting edge for a.. large number'xof reamingoperf ations.

Figures 4, 5 and 6 further illustrate that thc clearance 14 gradually decreases in Width toward the rear has integral blades.

It is to be understood that the form of engi of the blade as the ed of thcland 15 gradually diverge toward tgi the invention herewith shown and described is to be taken merely as a preferred example of the same and that such vminor changes in yarrangement. and construction of parts maybe made as will remain within t *8. A reamer blade having n rounded leed and a. land taperedqtc'', p'intgandmerging into the cutting edge of the lead to produce an additional cutting edge immediately back of the lead.

:4. lyeamerzbljade heviglffl'dand a. land tapered t an point and merging" into A,thecutting edge of the lead to produce an additional, cutting `edge `immediately back f'the lead.

BRANI; 1?, MlnLlgR. 

